72656725 has 12 divisors (see below), whose sum is σ = 95394564. Its totient is φ = 54705920.

The previous prime is 72656711. The next prime is 72656737. The reversal of 72656725 is 52765627.

It can be written as a sum of positive squares in 6 ways, for example, as 6754801 + 65901924 = 2599^2 + 8118^2 .

It is not a de Polignac number, because 72656725 - 2²³ = 64268117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85054 + ... + 85903.

It is an arithmetic number, because the mean of its divisors is an integer number (7949547).

Almost surely, 2^72656725 is an apocalyptic number.

It is an amenable number.

72656725 is a deficient number, since it is larger than the sum of its proper divisors (22737839).

72656725 is a wasteful number, since it uses less digits than its factorization.

72656725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170984 (or 170979 counting only the distinct ones).

The product of its digits is 176400, while the sum is 40.

The square root of 72656725 is about 8523.8914235225. The cubic root of 72656725 is about 417.2777929986.

It can be divided in two parts, 726 and 56725, that multiplied together give a triangular number (41182350 = T₉₀₇₅).

The spelling of 72656725 in words is "seventy-two million, six hundred fifty-six thousand, seven hundred twenty-five".